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Hope this is the right place for this question, I'm not good with these forums, anyway:
I've got a 2018 Transit 250MR LWB 3.5EB with a 150a alt and single battery. I've installed 3 200W solar panels with 3 100ah Battle Born Lithium batteries. I know that pushing it to be able to keep the batts changed so I'm trying to install battery isolator that is recommended for when using 3 BB lithium batts so I can help keep them charged when driving. The problem I'm running into is figuring out what to base the load on for wire and fuse sizing and then where to connect the wires to the starter battery. Ford as per a bulletin Q-226R2 says NOT to connect to the positive post unless there is a designated stud for it. The duel batt system is no problem but single does not have an extra post to work with. I thought about adding two extra CCPs so I would have 180a to work with but the terminal connectors are so small I don't see how I could get any battery size cable to connect them or how to splice the three together. As far as wire/fuse sizing goes should I use the max alt output or starter draw amperage? The BIM will allow me to use my house batts to self jumpstart the van. I was told by one person to base it off of 70% of the alt rating but even at that the charts say to use 2/0 or 1/0 wire with 150A fuses nor do I know where he came up with that figure. This all seems pretty massive to me. I've contacted both Battle Born and the manufacture of the Li-BIM 225 for help as well as a few FaceBook pages and not getting any help at all so thought I'd try here.
 

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With the 150 amp alternator and single Transit battery the most amps you can use is 30 amps according to ford.
Myself with the same setup I have been able to draw 50 amps from the alternator and have been doing so without problems for the last 3 years.

Read this forum thread.

 

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With the 150 amp alternator and single Transit battery the most amps you can use is 30 amps according to ford.
Myself with the same setup I have been able to draw 50 amps from the alternator and have been doing so without problems for the last 3 years.
I have the standard alternator plugged to my house battery through a relay (victron cyrix), made my system so it could support 120 amps.. fact is all the times I checked what the battery was actually taking it barely took more than 10-12 amps AT BEST (charging from 85% SOC). More often it took less thant 7 amps.
Of course the more your battery is discharged, the more AMPS it will draw.
 
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